Safety device for elevators



(No Model.) I 2 SheetsSheet 1.

W. P. KIDDER.

SAFETY DEVICE FOR ELEVATORS. No. 525,422. r I Patented Sept. 4, 1894 (No Model.)

W. P. KIDDER.

'2 Sheets-Sheet 2.

SAFETY DEVICE FOR ELEVATORS.

Patented Sept. 4, 1894 ljl 25 g WM 7 67 W attozM-m UNITED STATES PATENT OFFICE.

WELLINGTON P. KIDDER, OFBOSTON, MASSACHUSETTS.

SAFETY DEVICE FOR ELEVATORS.

SPECIFICATION forming part of Letters Patent No. 525,422, dated September 4, 1894.

Application filed May 22, 1893- To all whom it may concern.-

Be it known that I, WELLINGTON P. KID- DER, a citizen of the United States of America, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Safety Devices for Elevators, of which the following is a specification, reference being had therein to the accompanying drawings.

This improvement relates to safety devices on the principle of that shown in my Patent No. 495,094, dated April 11, 1893, but of different construction, part of which may be used in connection with the stops shown in my aforesaid patent and also with the stops shown in my application for a patent, Serial No. 473,780, filed May 11, 1893, and is designed to use such safety devices in connection with the starting levers or controllers sometimes used in lieu of the usual operating rope. To enable me to use my aforesaid safety devices with such starting levers, I have devised a .plan of connecting the stops with said starting levers, which is shown in the accompanying drawings, fully described herein, and then definitely claimed at the end hereof.

In the accompanying drawings-Figure l is an elevation showing the car, well doors, &c., looking toward the Well doors. Fig. 2 is a plan of thesame with the stop in position to allow the door to open. Fig. 3 is a plan showing the door locked by the stop. Fig. 4 is a modification showing a different connection between the door and stop. Fig. 5 isamodification with stops such as shown in my application before referred to, but with a rigid stop carrier, instead of the rope as shown in said application. Fig. 6 is an elevation of another modification in which supplemental ropes are employed to carry the stops. Fig; 7 is another modification of the rope stop carr1er.

Referring now to the details of the drawings by letter and particularly to Figs. 1'to3, A represents the car which may be operated in any suitable way, and is provided with the starting lever or controller B, to which is connected the valve operating ropes C, which pass over and under pulleys D mounted on levers E, the lower one of which should be connected with the valve or other device for setting the hoisting apparatus in motion and sens No.475,081. (in model.)

is fixedly attached to a shaft F, but as this device is well known and forms no part of my "nvention, it is unnecessary to further describe the same.

. On the shaft F, I secure a toothed segment G, which gears with a pinicn II, on a shaft I, mounted in suitable bearings J, and carrying a series of disks K, one for each well-door, each disk having a groove is of sufficient width to allow the bottom of a well doorL to slide through it.

The operation is as follows: Supposing the car to be in motion, the stop will be in the position shown in Fig. 3, and the well door cannot be opened as its edge would come in contact with the disk K, but as the operator moves the lever B to the position shown in Fig. 1 to stop the car, the segment operates on the pinion H, thus turning the shaft I and causing the stop to assume the position shown in Fig. 2, in which position the well door can be opened. After the door is opened, the lever B is locked fast and thus the shaft I cannot be turned, and so the car cannot be started, as no motion can be given to the lever or levers E, because the shaft I is kept from turning bythe door L being in the groove k; but when the door is closed, it will have been moved out of the groove 70 and then the shaft I and the gearing connected thereto can be readily moved and the car started.

It is obvious that instead of the bottom of the door being made to pass through, the groove, in the disk K, shown in-Figs. 1 to 3, a projecting plate Z such as is shown in Fig. 4 extending along the bottom of the door L may be arranged to pass through agroove in the disk K-in the same manner, as the door passes through the groove. Such a projecting plate, I should consider as part of the door and Where I use the word door in the claims at the end of this specification, I mean a door either with or without such a projecting plate as the case may be.

In the modification shown in Fig. 5, I attach to the shaft F a lever M to one end of which is pivoted a rod N running in suitable guides in and carrying the rising and falling stops N which co-actwith the door stops 0, as shown in my application above referred to or with the doors as shown in my aforesaid Patent No. 495,094. The lever M is preferably provided with a counterbalance weight I. The rod N may be sufficiently rigid to dispense with the guides for the stops shown in myapplicatiomSerialNo.473,780. Insteadof usingthe shaft I or rod N, I may use a rope to carry the stops, as shown in my above mentioned patent and application, in which case I attach to the shaft F a pulley Q (see Fig. 6) to which I connect the ends of the stop rope R having stops S fast thereon, which rope passes around a pulley T at the top of the elevator well. At U are shown guide pulleys todeflect the stop rope in the desired position, to suit the doors, but these will not be required in all cases. Instead of using the pulleys Q T, I may provide the levers E with extensions as shown in Fig. 7, to which I attach ropes R, one of which carries the stop S. Any movement imparted to the starting lever will of:

course give motion to the levers E, and these in their turn will give motion tothe ropes R, and thus the stop S will be moved up and down, or left at the central position as desired. Of course wh ere ropes are used'to carry the stops, there should be guides employed to keep them in position, although I have not shown them in the drawings. \Vires, rods, straps, chains or other similar equivalents may housed in lieu of the ropeR if desired, without departing from the spirit of my invention, and the better to define my invention I shall generally use the term stop carrier in lieu of rope in my claims.

When referring to the device or devices carrying the stops I do not limit myself to the particular form of operating lever and connections shown, but intend to attach my supplementary stop connection withany and every form of controlling device I may find convenient to use it with, and should consider any such controlling device or controller as an equivalent of the lever and ropes-shown in the drawings, except in claims where a lever and rope are specifically referred to.

I am aware that it has been proposed to provide a door with a plate or stop adapted to enter a groove in the bottom of a car, so that said car cannot readily be moved until the door has been closed; but such an ar- I rangement is essentially different from mine, inasmuch as there is nothing in such device to prevent the moving of the rope to start the hoisting machinery, which maytherefore be started, with the probability of breaking off the plate or stop from its fastenings or dam.- 3

aging the door or elevator cage, and with the furtherliability of damage to life or limbafter such first-mentioned damage had: beenaccom plished,while with my invention the hoisting machinery cannot be started until the door is closed. I am alsoaware thata swinging door has been provided with swinging projections adapted to pass through recesses in movable stops, but this is also objectionable, because the door can be used as a lever displaced by the great power that canbe ex erted: by'theproj'ectionson the door com ng into contact with the stops, as such pro ections form the short arm of alever, while the door forms a long arm thereof, and thus great ,damage may result from an attempt to open the door when the stops are in position to keep it closed. With my arrangement, on the contrary, the door slides and thus cannot be used as a lever, and any attempt to open the door when the stops are arranged so as to :keep it closed would only act to cant the a door over to the top as it strikes against the stop at the bottom, and thus serve to 3am the dOorfast, so that it could not be opened, and the greater the-force exerted underthesecir- 1 cumstances, thefaster the door would be held I closed.

What I claim as new is-- 1. The combination in an elevator andwith 1 the car andwell doors thereof, of acontroll'er 1 for the motive power, a supplemental stop cari rier operated by but distinct fl OHLSEtld coni troller, and supplementary stops for fastening the doors closed, mounted on, carried by l and moving with said supplemental stop carmen 2. The combination inanielevatorand with 1 the car and the well doors thereof, ofalever mounted. on the car, ropes connecting it-with and moving with it stops for each well door, constructed and arranged to simultaneously i look all of said doors connected to and moving simultaneously with the lever, substantially as described.

3. In an elevator and in combination with the well doors. thereof, a turning shaft run- :ning from floor to floor, and stops for each door mounted on and operated by said shaft 5 and securely fasteningsaid doors closed, substantially as described.

4. In an elevator and in combination with the well doors thereof, a turning shaft, and 1 stops for each door mounted on, carriedand operated thereby and securely fastening said doors closed, substantially as described.

5. In an elevator and in combination with the well doorsand the car thereof, a turning shaft running to the different floors and grooved disks mounted thereon, constructed to receive the doors in the grooves when the 1 car is at rest, substantially as described.

6. In an elevator and in combination with l the well doors, the carand controllerthereof, a stop carrier distinct from the controlling *rope running to the different floors, stops for 1 fastening each door securelyclosed,mounted on and carried by said carrier and intermediate mechanism, substantially as described, between the controller and the stop carrier, as set forth.

7. In an elevator and in combination with a well door, thecar and controller thereof, a shaft connected with the controller, a toothed of considerable power when being swung open, and thus the stops may be broken or segment on said shaft, a pinion gearing with the hoisting mechanism, and; a-stop carrier distinct from the rope and having secured to such segment, a shaft on which said pinion is said shaft and co-operating with the well door, [0 mounted, and a stop connected to said shaft, substantially as described and shown. substantially as described. In testimony whereof Iaffix my signature,in 8. In an elevator and in combination with presence of two witnesses, this 19th day of a well door, the car and the starting lever May, 1893.

thereof, the ropes O, levers E, shaft F, seg- WELLINGTON P. KIDDER. ment G fast on shaft F, pinion H meshing Witnesses: with said segment, the shaft I carrying said EDWARD S. BEACH,

pinion, and the grooved disk K mounted on F. L. GOODHUE. 

